Nice with ipad user agent string
Mozilla/5.0 (iPad; CPU OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3
The volume buttons should probably control media volume rather than calls/alerts while the browser is open, as they do with media players, etc. Currently, to change the volume of sound in videos or on a webpage, you have to swipe out of the app and use the menu.